SDL: aaudio: We PlayDevice first and WaitDevice after; reduce semaphore count by 1. (c56a1)

SDL Commits
1 
From c56a1c664cb85cb53b95c60d9301e5027ede843f Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <[EMAIL REDACTED]>
Date: Fri, 25 Apr 2025 12:49:41 -0400
Subject: [PATCH] aaudio: We PlayDevice first and WaitDevice after; reduce
 semaphore count by 1.

Previously, we would WaitDevice first, but that would feed a silent buffer
to AAudio upfront, introducing latency. When this change was made, the
semaphore count should have been adjusted, since we're waiting on one less
buffer.

Fixes #12882.

(cherry picked from commit 2767c1a440fc65184482a3ee0a664609fb6f9ada)
---
 src/audio/aaudio/SDL_aaudio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/audio/aaudio/SDL_aaudio.c b/src/audio/aaudio/SDL_aaudio.c
index 3360bec949fb1..95124546a9296 100644
--- a/src/audio/aaudio/SDL_aaudio.c
+++ b/src/audio/aaudio/SDL_aaudio.c
@@ -366,7 +366,7 @@ static bool BuildAAudioStream(SDL_AudioDevice *device)
     hidden->processed_bytes = 0;
     hidden->callback_bytes = 0;
 
-    hidden->semaphore = SDL_CreateSemaphore(recording ? 0 : hidden->num_buffers);
+    hidden->semaphore = SDL_CreateSemaphore(recording ? 0 : hidden->num_buffers - 1);
     if (!hidden->semaphore) {
         LOGI("SDL Failed SDL_CreateSemaphore %s recording:%d", SDL_GetError(), recording);
         return false;